While I was doing the replacement brake hose on the right rear brake on my 1994 Mercedes E320 Wagon, I noticed two wires (electrical?) sticking out on the brake caliper. Is that part of the whole caliper or a separate part that connects to the caliper? and needs to be replace? Or stick the wires inside the part? See the picture circled in color red. Any comments, suggestions, feedback or advice is greatly appreciated.

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